package com.edu.springmvc.helloworld.interceptor;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


@Component // 拦截器还需要配置（告诉SpringMVC，这个拦截器主要拦截什么请求）
public class MyHandlerInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws Exception {
        System.out.println("MyHandlerInterceptor, preHandler.");
        return true; // true 表示放行，false 表示不放行
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("MyHandlerInterceptor, postHandle.");
    }

    // preHandle返回true，afterCompletion才会执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("MyHandlerInterceptor, afterCompletion.");
    }
}
